CN101598579A - A kind of system and method for testing and labeling monitoring device of transportation of hazardous chemicals - Google Patents
A kind of system and method for testing and labeling monitoring device of transportation of hazardous chemicals Download PDFInfo
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Abstract
The invention discloses a kind of system and method for testing and labeling monitoring device of transportation of hazardous chemicals, wherein, described system comprises microprocessor module, data acquisition module and analog input module, described analog input module is used for the analog parameter that the watch-dog actual sensed technical parameter to the input of described watch-dog and described detected demarcation adapts; Described data acquisition module is used to gather the measurement data of described watch-dog, and outputs to described microprocessor module; Described microprocessor module is used for coming the described watch-dog of test calibration according to described measurement data and described analog parameter.The present invention is by adopting incorporate test calibration system and method; make a plurality of sensors and detector can demarcate test simultaneously; adopt the microprocessor unification that each equipment is demarcated; improve product test efficient, guarantee the sensor on the watch-dog in the transportation of danger product or the stable operate as normal of detector.
Description
Technical field
The present invention relates to calibration equipment and method, relate in particular to a kind of system and method for testing and labeling monitoring device of transportation of hazardous chemicals.
Background technology
Along with being surging forward of international multimodal transport business, the tank container/groove tank car that is used for the transportation of hazardous chemical is more and more.Yet Hazardous Chemical Substances leaks, loses and serious accident such as blast happens occasionally in the transportation, has caused serious property loss to people.For this reason, people have researched and developed multiple real-time follow-up, monitoring and the warning system that is used for dangerous material leak detection and container state monitoring.And be used for the used various sensors of detected set vanning internal state, be the key element of supervisory system.
But, be subjected to the influence of the problems such as output consistance of sensor, the transformational relation that outputs to analog quantity by sensor need obtain by test calibration, so tackle it before use and carry out test calibration, the test calibration platform that the production run that therefore is used for dangerous material leak detection and container state watch-dog presses for a kind of robotization comes various sensors are carried out test calibration.
And by existing traditional test test calibration method to detector, people are manual mostly to operate, and sensor is carried out test calibration and check, does not use microprocessor to carry out the automatic test calibration of sensor, and production efficiency can't improve.It comprises following step, before this to each manufacturer to the independent test calibration of each self-sensing, detector manufacturer tests self detector, and then coordinates to improve in practice.The a large amount of manpower and materials of this obviously test test calibration method first waste, secondly because detector has adopted multiple sensors, as pressure, liquid level, gas, humiture, door switch etc., crosstalking between each sensor also is difficult to solve with data fusion.
Therefore, prior art haves much room for improvement and improves.
Summary of the invention
The technical problem to be solved in the present invention is; at above the deficiencies in the prior art; provide a kind of use simple; can collect sensors such as pressure, liquid level, temperature, humidity, door switch and gas sensor, and the test calibration system and method for the test calibration of detector watch-dog in the danger product transportation of one.
The technical scheme that solves the technology of the present invention problem is as follows:
A kind of test calibration system is used for the watch-dog of test calibration dangerization product transportation, wherein, comprises microprocessor module, data acquisition module and analog input module, wherein,
Analog input module is used to produce the analog parameter that the technical parameter with the watch-dog actual sensed of described detected demarcation adapts, and sends to described watch-dog;
The data acquisition interface module is used to gather the measurement data that described watch-dog produces under described analog parameter excitation, and measurement data is sent to described microprocessor module;
Described microprocessor module is used for coming the described watch-dog of test calibration according to described measurement data and described analog parameter;
Wherein, described analog input module comprises the analog input unit that is used to produce a plurality of analog parameters, and described data acquisition module comprises the data acquisition unit of the measurement data that is used to gather a plurality of watch-dogs outputs.
Test calibration of the present invention system, wherein, described watch-dog is a gas sensor; Described analog input module comprises gas distributing system, and being used for provides predetermined gas concentration of analog parameter to described gas sensor; Described analog input module also comprises the humiture module, and being used for provides the humiture analog parameter to described gas sensor.
Test calibration of the present invention system, wherein, described watch-dog is a pressure transducer; Described analog input module is a piston gage, and being used for provides the pressure simulation parameter to described pressure transducer.
Test calibration of the present invention system, wherein, described watch-dog is a liquid level sensor; Described analog input module is a piston gage, and being used for provides the liquid level analog parameter to described liquid level sensor.
Test calibration of the present invention system, wherein, described watch-dog is a Temperature Humidity Sensor; Described analog input module is used under the control of described microprocessor module for connecting the humiture case of described microprocessor module, provides the temperature and humidity analog parameter to described liquid level sensor.
Test calibration of the present invention system, wherein, described watch-dog is a door switch sensor; Described analog input module is a magnetic medium, is used for changing the input information of door switch sensor by changing the magnetic field of door both sides.
Test calibration of the present invention system, wherein, watch-dog also comprises detector;
Described detector connects described microprocessor module and sensor, is used to gather the middle measurement data of described sensor, measurement data in the middle of described is carried out data fusion after, the data fusion result is sent to described microprocessor module;
Described microprocessor module is used for according to described data fusion result described detector being carried out test calibration.
A kind of test calibration method of watch-dog may further comprise the steps:
A, test calibration system initialization, the analog parameter that adapts to the technical parameter of the input of the watch-dog of tested demarcation and the watch-dog actual sensed of described detected demarcation;
The watch-dog of B, tested demarcation is responded to described analog parameter, and the output measurement data;
C, gather described measurement data, and according to described measurement data and the described watch-dog of described analog parameter test calibration.
Test calibration method of the present invention, wherein, described watch-dog is a detector, is connected with sensor on the described detector; Wherein,
Described steps A comprises: import the analog parameter that adapts with described sensor actual sensed technical parameter to the sensor that is connected on the described detector;
Described step B comprises: gather the middle measurement data of described sensor output, described detector carries out Data Fusion with measurement data in the middle of described, obtains final measurement data;
Described step C comprises: gather described final measurement data, and send checking command according to described final measurement data to described detector, by judging the response of described detector to described checking command, finish the test calibration to described detector.
Test calibration method of the present invention wherein, when described watch-dog is gas sensor, adopts gas distributing system under the accurate control of described microprocessor module, preparation and the predetermined gas concentration that needs to described gas sensor output; Adopt the humiture module humiture analog parameter to be provided for described gas sensor.
The present invention is by the incorporate test calibration of employing system; make pressure, liquid level, temperature, humidity, door switch, gas sensor or detector can demarcate test simultaneously; adopt the microprocessor unification that each equipment is demarcated; in each test calibration system even can demarcate a plurality of similar sensors simultaneously; improve product test efficient, guarantee the sensor on the watch-dog in the transportation of danger product or the stable operate as normal of detector.
Description of drawings
Fig. 1 is the test calibration system architecture diagram of the embodiment of the invention;
Fig. 2 is the test calibration system architecture diagram of the test calibration sensor of the embodiment of the invention;
Fig. 3 is the test calibration system architecture diagram of the test calibration detector of the embodiment of the invention;
Fig. 4 is a data fusion method process flow diagram in the detector test calibration of the embodiment of the invention;
Fig. 5 is the test calibration method process flow diagram roughly of the embodiment of the invention;
Fig. 6 is the test calibration method entire flow figure of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail.
The embodiment of the invention provides a kind of test calibration system of watch-dog; the watch-dog that is used for the transportation of test calibration dangerization product; be preferred for the watch-dog of the tank container/groove tank car of the transportation of test calibration hazardous chemical, as sensor and detector etc.This test calibration system 100 comprises microprocessor module 110, data acquisition module 120 and analog input module 130, as shown in Figure 1.Wherein analog input module 130 is used to produce the analog parameter that the technical parameter responded to the watch-dog of detected demarcation adapts, and sends to watch-dog 200.Data acquisition interface module 120 is used for the measurement data that acquisition monitoring device 200 produces under the analog parameter excitation, and measurement data is sent to microprocessor module 110.Microprocessor module 110 shows measurement data, and according to the analog parameter test calibration watch-dog 200 of this measurement data and input.Wherein, analog input module 130 can comprise the analog input unit that is used to produce a plurality of analog parameters, data acquisition interface module 120 can comprise the data acquisition unit of the measurement data that is used to gather a plurality of watch-dogs outputs, to finish the test calibration to a plurality of watch-dogs.
In the present embodiment, watch-dog 200 can be sensor, comprises gas, pressure, liquid level, door switch, Temperature Humidity Sensor etc.Can be one of them sensor, also can be a plurality of sensors and demarcate simultaneously.Test calibration system 100 comes the characterisitic parameter of each sensor of test calibration by to each sensor input simulation parameter, finishes the test calibration to single sensor, as shown in Figure 2.
When the test calibration system 100 in the present embodiment was used for calibration gas sensor 201, as shown in Figure 2, corresponding simulating load module 130 can be gas distributing system 131, is used for providing the analog parameter of predetermined gas concentration to gas sensor 201; Also the humiture module can be set, provide the humiture analog parameter to gas sensor.Wherein, gas distributing system 131 is a control center with the computing machine, at first computing machine adds driving circuit by the D/A card, the control voltage of the heating voltage of program control one to three gas sensor, five mass flow controllers (MFC), thereby accurately the pilot-gas delivery rate is allotted desirable gas concentration.Secondly, according to from A/D card real-time sampling to the flow feedback voltage signal of MFC, start or close solenoid valve and constitute closed-loop control, reach automatic adjusting, accurately distribution.
While data acquisition module 120 (can be the A/D card 121 on the PC), gather the dynamic response data of gas sensor 201 and the working temperature and the humidity of survey sensor in real time, program control humiture case guarantees the stable of gas sensor 201 demarcation environment, in real time the data that collect is preserved and demonstration by software programming.Import gas sensor any gas concentration to be measured under normal operation circumstances in real time by such design, thus the purpose that reaches calibration gas sensor 201 and demarcate detector in conjunction with total flow process.
Gather the in good time output measurement data of gas sensor 201 by A/D card 121, each major parameter that comprises gas sensor 201: as sensitivity, response and release time, selectivity, the response time that powers on, zero value etc., comprehensively each parameter is judged the quality of gas sensor.Because gas sensor is very sensitive to environment in the actual test, so in the real system during test calibration gas sensor, also can provide variable constant temperature and humidity condition by microprocessor control moisture temperature case, organize its change curve of test, so that demarcate more accurate to each parameter in the concrete environment more.
When the system in the present embodiment is used for nominal pressure sensor 202 or demarcates liquid level sensor 203, adopt piston gage 132 as analog input, the pressure simulation parameter is provided for pressure transducer 202, and the liquid level analog parameter is provided for liquid level sensor 203.Pressure is substantially the same with the liquid level sensor principle, WYB pressure resistance type pressure unit is adopted in the transmission of pressure sensor signal, this transmitter has adopted the sensitive element based on piezoresistive effect, and be furnished with the high-precision signal treatment circuit, have that working temperature is wide, precision is high, long-time stability are good and advantage such as long-life.Piston gage 132 is based on the normal pressure gauging instrument of a kind of pin-point accuracy, high repdocutbility and the high confidence level of Pascal law and the generation of hydrostatic equilibrium principle, uses it to pressure and liquid level sensor analog input.Utilize software to come its corresponding sensor of test calibration, contrast the data that record on the detector simultaneously and come detector is carried out test calibration, its pressure liquid level output is 4～20mA electric current loop.Be converted into 0.6 to the 3V magnitude of voltage by being connected in series 150 Europe resistance, in like manner gather in good time output with the A/D card on the microprocessor, draw concrete parameter and now judge in gas sensor.
When the system in the present embodiment was used to demarcate Temperature Humidity Sensor 204, analog input was used under the control of microprocessor module 110 for connecting the humiture case 133 of microprocessor module, provides the temperature and humidity analog parameter to Temperature Humidity Sensor 204.The input of Temperature Humidity Sensor 204 utilizes high low temperature test box can reach temperature from-40～140 ℃, and relative humidity is output as 0～5V voltage from 0～100%RH, adopts the I of standard
2C communication.Wherein, humiture case 133 is by microprocessor control, and the output signal of humiture is to pass through I
2C interface collects slave computer, uploads to processes and displays on the test calibration platform of microprocessor module 110 by slave computer 122 again.
When the system in the present embodiment is used to demarcate door switch sensor 205, be analog input with magnetic medium 134.Door switch sensor 205 comes down to utilize the magnetic field between the magnetic medium that is contained in door two limits, and the variation in door Push And Release process designs.So only need can obtain desirable analog input with identical magnetic medium.Door switch sensor has two kinds of patterns: wireless receiving and wired reception.Wired reception is by serial ports (RXD) received signal of microprocessor, and wireless receiving adopts the external interrupt pin of microprocessor to come the simulative serial port received signal.In the actual test calibration system, adopt slave computer receiving gate switch sensor measurement data, be its state change amount, and by slave computer its state change amount uploaded on the microprocessor and to handle that this test calibration system can demarcate 1～32 door switch sensor simultaneously.
In a further embodiment, the test calibration system also can be used for test calibration detector 206, and detector 206 connects sensor, and connects microprocessor module 110, as shown in Figure 3.Wherein sensor can be above-mentioned various kinds of sensors, as in gas, pressure, liquid level, humiture, the door switch sensor one or several.Because watch-dog 200 (sensor or detector) needs the environmental parameter of monitoring transportation equipment,, must adopt a plurality of sensors composition multiclass sensors to gather and finish this monitoring task jointly if think to grasp the environmental aspect of transportation equipment comprehensively.For precision and the reliability that improves testing result, use multi-information merging technology, merge multi-sensor data information, in the hope of being familiar with more accurately, all sidedly and describing monitoring target, thereby make right judgement and decision-making.
In the present embodiment, above-mentioned various kinds of sensors as gas, pressure, liquid level, humiture, door switch sensor etc., all can be linked on the detector, also can only insert one or more as required.Whether detector will be discerned the sensor that is connected automatically access or normal, the middle measurement data of pick-up transducers, after the line data of going forward side by side merges, the data fusion result is uploaded on the microprocessor module 110 by the serial ports of test calibration system, microprocessor module 110 can carry out dissection process and demonstration in good time to data, and give detector 206 according to the result transmitting order to lower levels, test the quality of test calibration detector by the response data of retaking of a year or grade detector 206, can also finish compensation by microprocessor module 110 to each transducer zeroing value, whether the data fusion that detects 206 pairs of a plurality of sensors of detector is reasonable, the final quality of judging detector 206 is finished the test calibration to detector.
In the present embodiment, Data Fusion is finished by microprocessor module 206, and its method flow as shown in Figure 4.At first the measurement data that obtains according to each sensor is calculated elementary probability partition function, degree of confidence and the likelihood score of each evidence (be each parameter value that needs detected characteristics, as the atmospheric pressure value in the container, humiture value, etc.); Calculate elementary probability partition function, degree of confidence and likelihood score under all evidence combined effects according to the rule of combination of D-S means of proof then; Select the hypothesis of degree of confidence and likelihood score maximum as the final fusion results of system according to given decision rule at last.Owing to can rely on the accumulation of evidence based on the D-S evidence theory, constantly dwindle hypothesis set, has stronger theoretical foundation, can handle the uncertainty that randomness causes, can handle the uncertainty that ambiguity causes again, its judged result is accurate, can solve in the prior art to demarcate when having adopted the detector of multiple sensors crosstalking and the problem of data fusion between each sensor.
Based on above test calibration system; the present invention also provides a kind of test calibration method that is used for the watch-dog of test calibration dangerization product transportation; its process flow diagram as shown in Figure 5, the test calibration system below in conjunction with the embodiment of the invention is described below its scaling method:
Step S101, test calibration system initialization are to the watch-dog input of tested demarcation and the analog parameter of the watch-dog actual sensed of described detected demarcation;
As the description of front, when watch-dog is detector, to the sensor input analog parameter that is connected on the detector to the test calibration system of the embodiment of the invention; Work as calibration gas sensor, or demarcate when being connected with the detector of gas sensor, adopt gas distributing system to provide predetermined gas concentration of analog parameter to gas sensor; And can adopt the humiture module to provide the humiture analog parameter simultaneously to gas sensor, can provide variable constant temperature and humidity condition by microprocessor control moisture temperature case, test many its change curves of group, so that demarcate more accurate to each parameter in the concrete environment; When demarcating Temperature Humidity Sensor, can directly adopt the humiture case that variable constant temperature and humidity parameter is provided; In like manner, when nominal pressure and liquid level sensor, can use piston gage that the analog input parameter is provided; All the other transducer calibration corresponding simulating input modes are specifically seen before and are stated description to the test calibration system.
The watch-dog induction analog parameter of step S102, tested demarcation, and output measurement data;
As the description of front, when watch-dog is sensor, can directly gather the output measurement data of respective sensor under analog input stimulates to the test calibration system of the embodiment of the invention; When watch-dog is detector, the middle measurement data of detector pick-up transducers output, centering measurements data are carried out Data Fusion, obtain final measurement data.
Step S103, collection measurement data, and according to measurement data and analog parameter test calibration watch-dog;
As the description of front to the test calibration system of the embodiment of the invention, when watch-dog is detector, microprocessor module is gathered the final measurement data of detector output, and send checking command to detector according to this final measurement data, by judging detector the response data of checking command is finished test calibration to detector.
When the test calibration system had detector calibrating function and transducer calibration function simultaneously, its test calibration using method process flow diagram was described in detail below in conjunction with Fig. 6 as shown in Figure 6:
Microprocessor module (PC), enter calibration interface after system carry out initialization automatically, the user can select to enter the detector calibration mode as required or enter the transducer calibration pattern.Under the transducer calibration pattern, native system is only gathered the measurement data of the sensor output that needs demarcation, and it is demarcated; When in detector calibration mode following time, detector is gathered the measurement data of each sensor, the line data fusion treatment of going forward side by side, and microprocessor is gathered the final measurement data of detector output then, as with reference to detector is demarcated.Microprocessor can be finished functions such as the printing, output, preservation of follow-up final calibration result.
In sum; the present invention is by the incorporate test calibration of employing system; make pressure, liquid level, temperature, humidity, door switch, gas sensor or detector can demarcate test simultaneously; adopt the microprocessor unification that each equipment is demarcated; in each test calibration system even can demarcate a plurality of similar sensors simultaneously; as the time demarcate at least 3 gas sensors; improve product test efficient, guarantee the sensor on the watch-dog in the transportation of danger product or the stable operate as normal of detector.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (10)
1, a kind of test calibration system is used for the watch-dog of test calibration dangerization product transportation, it is characterized in that, comprises microprocessor module, data acquisition module and analog input module; Wherein,
Described analog input module is used for the analog parameter that the watch-dog actual sensed technical parameter to the input of described watch-dog and described detected demarcation adapts;
Described data acquisition module is used to gather the measurement data that described watch-dog produces under described analog parameter excitation, and described measurement data is sent to described microprocessor module;
Described microprocessor module is used for coming the described watch-dog of test calibration according to described measurement data and described analog parameter;
Described analog input module comprises the analog input unit that is used to produce a plurality of described analog parameters, and described data acquisition module comprises the data acquisition unit of the measurement data that is used to gather a plurality of watch-dogs outputs.
2, test calibration as claimed in claim 1 system is characterized in that described watch-dog comprises gas sensor; Described analog input module comprises gas distributing system, and being used for provides predetermined gas concentration of analog parameter to described gas sensor; Described analog input module also comprises the humiture module, and being used for provides the humiture analog parameter to described gas sensor.
3, test calibration as claimed in claim 1 system is characterized in that described watch-dog comprises pressure transducer; Described analog input module comprises piston gage, and being used for provides the pressure simulation parameter to described pressure transducer.
4, test calibration as claimed in claim 1 system is characterized in that described watch-dog comprises liquid level sensor; Described analog input module comprises piston gage, and being used for provides the liquid level analog parameter to described liquid level sensor.
5, test calibration as claimed in claim 1 system is characterized in that described watch-dog comprises Temperature Humidity Sensor; Described analog input module comprises the humiture case that connects described microprocessor module, and being used for provides the temperature and humidity analog parameter to described liquid level sensor under the control of described microprocessor module.
6, test calibration as claimed in claim 1 system is characterized in that described watch-dog is a door switch sensor; Described analog input module is a magnetic medium, is used for changing the input information of door switch sensor by changing the magnetic field of door both sides.
7, as each described test calibration system in the claim 1 to 6, it is characterized in that watch-dog also comprises detector;
Described detector connects described microprocessor module and sensor, is used to gather the middle measurement data of described sensor, measurement data in the middle of described is carried out data fusion after, the data fusion result is sent to described microprocessor module;
Described microprocessor module is used for according to described data fusion result described detector being carried out test calibration.
8, a kind of test calibration method of watch-dog may further comprise the steps:
A, test calibration system initialization, the analog parameter that adapts to the technical parameter of the input of the watch-dog of tested demarcation and the watch-dog actual sensed of described detected demarcation;
The watch-dog of B, tested demarcation is responded to described analog parameter, and the output measurement data;
C, gather described measurement data, and according to described measurement data and the described watch-dog of described analog parameter test calibration.
9, test calibration method as claimed in claim 8 is characterized in that, described watch-dog is a detector, is connected with sensor on the described detector; Wherein,
Described steps A comprises: import the analog parameter that adapts with described sensor actual sensed technical parameter to the sensor that is connected on the described detector;
Described step B comprises: gather the middle measurement data of described sensor output, described detector carries out Data Fusion with measurement data in the middle of described, obtains final measurement data;
Described step C comprises: gather described final measurement data, and send checking command according to described final measurement data to described detector, by judging the response of described detector to described checking command, finish the test calibration to described detector.
10, test calibration method as claimed in claim 9, it is characterized in that, when described watch-dog is gas sensor, adopt gas distributing system under the accurate control of described microprocessor module, preparation and the predetermined gas concentration that needs to described gas sensor output; Adopt the humiture module humiture analog parameter to be provided for described gas sensor.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101936754A (en) * | 2010-09-01 | 2011-01-05 | 南京卡尔胜水电科技有限公司 | On-line self-correcting method of measuring data of dam safety monitoring automated data acquisition device |
| CN102955472A (en) * | 2011-08-25 | 2013-03-06 | 北京七星华创电子股份有限公司 | Digitalized instrument calibrating device |
| CN104007676A (en) * | 2014-05-08 | 2014-08-27 | 潍柴动力股份有限公司 | Data calibration method and control system |
| CN109342985A (en) * | 2018-11-16 | 2019-02-15 | 南方电网科学研究院有限责任公司 | A kind of magnetoresistive chip calibration correction system and method |
| CN110426492A (en) * | 2019-08-01 | 2019-11-08 | 无锡格林通安全装备有限公司 | A kind of test method of gas detector, apparatus and system |
| CN111765918A (en) * | 2020-06-12 | 2020-10-13 | 中国航空工业集团公司北京长城航空测控技术研究所 | Moisture test calibration device and method under ultra-wide temperature |
| CN113109510A (en) * | 2021-03-25 | 2021-07-13 | 山东瑶安电子科技发展有限公司 | Calibration device for gas sensor |
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- 2009-06-18 CN CN2009101082366A patent/CN101598579B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936754A (en) * | 2010-09-01 | 2011-01-05 | 南京卡尔胜水电科技有限公司 | On-line self-correcting method of measuring data of dam safety monitoring automated data acquisition device |
| CN101936754B (en) * | 2010-09-01 | 2012-02-01 | 南京卡尔胜水电科技有限公司 | On-line self-correcting method of measuring data of dam safety monitoring automated data acquisition device |
| CN102955472A (en) * | 2011-08-25 | 2013-03-06 | 北京七星华创电子股份有限公司 | Digitalized instrument calibrating device |
| CN102955472B (en) * | 2011-08-25 | 2014-09-03 | 北京七星华创电子股份有限公司 | Digitalized instrument calibrating device |
| CN104007676A (en) * | 2014-05-08 | 2014-08-27 | 潍柴动力股份有限公司 | Data calibration method and control system |
| CN109342985A (en) * | 2018-11-16 | 2019-02-15 | 南方电网科学研究院有限责任公司 | A kind of magnetoresistive chip calibration correction system and method |
| CN110426492A (en) * | 2019-08-01 | 2019-11-08 | 无锡格林通安全装备有限公司 | A kind of test method of gas detector, apparatus and system |
| CN111765918A (en) * | 2020-06-12 | 2020-10-13 | 中国航空工业集团公司北京长城航空测控技术研究所 | Moisture test calibration device and method under ultra-wide temperature |
| CN111765918B (en) * | 2020-06-12 | 2022-04-19 | 中国航空工业集团公司北京长城航空测控技术研究所 | Moisture test calibration device and method under ultra-wide temperature |
| CN113109510A (en) * | 2021-03-25 | 2021-07-13 | 山东瑶安电子科技发展有限公司 | Calibration device for gas sensor |
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